While everyone is going around in circles arguing about whether the disarm was legal, does anybody actually have any law (case cites) to use in their point-by-point/moment-by-moment analysis?
As far as I can tell, the cop went to the wrong house, spoke to a citizen who was not himself at the correct address, who was not brandishing, then seized that citizen, then seized his gun. All the while, with no RAS that I can see.
Terry requires three things: reasonable suspicion about the detainee and crime + reasonable suspicion the suspect is armed + reasonable suspicion the detainee is presently dangerous.
As Hendu said, the cop started walking up the driveway to talk to him before noticing the gun. Plainly the cop didn't think he was the brandisher, especially when Hendu told the cop which was the correct house and that he was the one who called before the cop started up the driveway.
I'm thinking the cop walked up the driveway to get more info from Hendu about what he witnessed, as an alternative to walking up to the door of the correct house and trying a knock-and-talk. As he started up the driveway, the cop would have no RAS Hendu was actually the brandisher. That the police quickly stowed Hendu's gun and went to the correct house, shows their level of suspicion.
It looks to me like the cop over-reacted and seized both Hendu and the gun.
I am willing to be wrong, though,--IF someone supplies the relevant case law.